PDF::Writer：#skew_axis

require 'pdf/writer'

pdf = PDF::Writer.new
pdf.skew_axis(10)
pdf.rectangle(100, 100, 100, 50).stroke

pdf.skew_axis(10, 20)
pdf.rectangle(100, 300, 100, 50).stroke

File.open("2008022600.pdf", "wb") { |f| f.write pdf.render }